/*
 * Copyright 2002-2017 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.scheduling.support;

import java.lang.reflect.InvocationTargetException;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import org.springframework.beans.factory.BeanClassLoaderAware;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.beans.support.ArgumentConvertingMethodInvoker;
import org.springframework.lang.Nullable;
import org.springframework.util.ClassUtils;

/**
 * Adapter that implements the {@link Runnable} interface as a configurable
 * method invocation based on Spring's MethodInvoker.
 *
 * <p>Inherits common configuration properties from
 * {@link org.springframework.util.MethodInvoker}.
 *
 * @author Juergen Hoeller
 * @see java.util.concurrent.Executor#execute(Runnable)
 * @since 1.2.4
 */
public class MethodInvokingRunnable extends ArgumentConvertingMethodInvoker
        implements Runnable, BeanClassLoaderAware, InitializingBean {

    protected final Log logger = LogFactory.getLog(getClass());

    @Nullable
    private ClassLoader beanClassLoader = ClassUtils.getDefaultClassLoader();


    @Override
    public void setBeanClassLoader(ClassLoader classLoader) {
        this.beanClassLoader = classLoader;
    }

    @Override
    protected Class<?> resolveClassName(String className) throws ClassNotFoundException {
        return ClassUtils.forName(className, this.beanClassLoader);
    }

    @Override
    public void afterPropertiesSet() throws ClassNotFoundException, NoSuchMethodException {
        prepare();
    }


    @Override
    public void run() {
        try {
            invoke();
        } catch (InvocationTargetException ex) {
            logger.error(getInvocationFailureMessage(), ex.getTargetException());
            // Do not throw exception, else the main loop of the scheduler might stop!
        } catch (Throwable ex) {
            logger.error(getInvocationFailureMessage(), ex);
            // Do not throw exception, else the main loop of the scheduler might stop!
        }
    }

    /**
     * Build a message for an invocation failure exception.
     *
     * @return the error message, including the target method name etc
     */
    protected String getInvocationFailureMessage() {
        return "Invocation of method '" + getTargetMethod() +
                "' on target class [" + getTargetClass() + "] failed";
    }

}
